{"id":120584,"date":"2024-01-01T18:00:55","date_gmt":"2024-01-01T12:30:55","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=120584"},"modified":"2024-01-01T18:23:34","modified_gmt":"2024-01-01T12:53:34","slug":"swift-enumerations","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/swift-enumerations\/","title":{"rendered":"Swift Enumerations"},"content":{"rendered":"

Enumerations are a custom data type. It makes a group of related values as a single data type. It provides type safety for various cases or states. It is also known as enums.<\/p>\n

In this article, we\u2019ll learn about its declaration, usage and concepts related to it. We understand this with the help of relevant examples.<\/p>\n

Declaration and Usage<\/h2>\n

We define an enum with an enum keyword followed by an enum\u2019s name. We enclose the different cases of the enum within curly braces {}. We define the cases with the case keyword followed by the name of the case. The following syntax and example will explain this better.<\/p>\n

The syntax of using enums is<\/strong><\/p>\n

enum enumName{\r\n    case caseName1\r\n    case caseName2\r\n    ...\r\n    case caseNameN\r\n}<\/pre>\n
An example of an enum is as follows<\/strong><\/p>\n
enum enumExample{\r\n    case Sunny\r\n    case Windy\r\n    case Rainy\r\n}<\/pre>\n
We can access each of the cases in the following way<\/strong><\/p>\n
enumName.caseName<\/pre>\n
Enums with Switch Statement<\/h3>\n
The switch statements involve the usage of cases. Enumerations allow a multi-way selection of cases in a switch statement.<\/p>\n
enum enumExample{\r\n    case DataFlair\r\n    case Swift\r\n    case SwitchStatements\r\n    case Enumerations\r\n}\r\n\r\nvar example = enumExample.DataFlair\r\nswitch(example){\r\n    case .DataFlair:\r\n        print(\"DataFlair selected\")\r\n    case .Swift:\r\n        print(\"Swift selected\")\r\n    case .SwitchStatements:\r\n        print(\"Switch Statements selected\")\r\n    case .Enumerations:\r\n        print(\"Enumerations selected\")\r\n}<\/pre>\n
Output:<\/strong><\/p>\n
DataFlair selected<\/p>\n
Enums with Raw Values<\/h3>\n
We can assign constant values to each of the cases in an enum. These values are called Raw values. These values can be of any data type.<\/p>\n
enum enumExample: Int{\r\n    case thisYear = 2023\r\n    case lastYear = 2022\r\n    case nextYear = 2024\r\n}\r\n\r\nvar year = enumExample.thisYear\r\n\r\nprint(year.rawValue)<\/pre>\n
Output:<\/strong><\/p>\n
2023<\/p>\n
Enums with Associated Values<\/h3>\n
We can have values associated with each case of enums. For example,<\/strong><\/p>\n
enum enumExample{\r\n    case name(String)\r\n    case date(Int, Int)\r\n}\r\n\r\nvar name = enumExample.name(\"DataFlair\")\r\nvar date = enumExample.date(11, 2023)\r\n\r\nprint(name, date)<\/pre>\n
Output:<\/strong><\/p>\n
name(“DataFlair”) date(11, 2023)<\/p>\n
A practical example of using enums with associated value is maintaining an inventory. These inventories identify every product with a unique ID. These IDs can be presented using QR codes or UPC codes. The QR code usually depicts a unique string. The UPC code represents a tuple of integer values.<\/p>\n
enum productID{\r\n    case productUPCCode(Int, Int, Int, Int)\r\n    case productQRCode(String)\r\n}\r\n\r\nvar productWithQR = productID.productQRCode(\"SCANTHEQRCODE\")\r\nvar productWithUPC = productID.productUPCCode(6, 10762, 56932, 7)\r\n\r\nprint(productWithQR)\r\nprint(productWithUPC)<\/pre>\n
Output:<\/strong><\/p>\n
productQRCode(“SCANTHEQRCODE”)
\nproductUPCCode(6, 10762, 56932, 7)<\/p>\n
Distinction between Raw and Associated Values<\/h3>\n\n\n\n\n\n\n\n
Raw Value<\/b><\/td>\nAssociated Value<\/b><\/td>\n<\/tr>\n
Constant values assigned to cases<\/span><\/td>\nValues are assigned based on variable-defined<\/span><\/td>\n<\/tr>\n
All the raw values must be of the same type<\/span><\/td>\nThe associated values can be of different types<\/span><\/td>\n<\/tr>\n
Value remains the same throughput<\/span><\/td>\nValue varies every time defined<\/span><\/td>\n<\/tr>\n
Eg: <\/span>enum{2022, 2023}<\/b><\/td>\nEg: <\/span>enum{\u201cDataFlair\u201d, 2023}<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Conclusion<\/h3>\n
Enumerations make a group of related values as a single data type. This article covers enums and concepts related to it. We have seen how to use enums in switch statements. We also learned about raw values and associated values in enums.<\/p>\n","protected":false},"excerpt":{"rendered":"
Enumerations are a custom data type. It makes a group of related values as a single data type. It provides type safety for various cases or states. It is also known as enums. In...<\/p>\n","protected":false},"author":581,"featured_media":120586,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27789],"tags":[28460,28459,28287],"class_list":["post-120584","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-swift-tutorials","tag-enumerations-in-swift","tag-swift-enumerations","tag-swift-tutorials"],"yoast_head":"\nSwift Enumerations - DataFlair<\/title>\n<meta name=\"description\" content=\"Enumerations make a group of related values as a single data type. 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